Endgame Strategy and POE Currency
Once you’ve acquired the necessary skills, your endgame strategy should focus on crowd control and burst damage. Use PermaFrost Bolts to freeze enemies, setting them up for Path of exile currency detonation with Fragmentation Rounds, Explosive Grenades, and Explosive Shot. Combine Incendiary Shot and Gas Grenade for extra sustained damage, while using Oil Grenade to set up massive explosions.

For POE currency and items, consider investing in:

Crossbows with high Attack Speed, Critical Strike Chance, and Elemental Damage bonuses.
Rings and Amulets that increase Cold, Fire, and Poison damage.
Energy Shield and Life for survivability, as well as Movement Speed for mobility.
To maximize your damage output, use Exalted Orbs, Chaos Orbs, and Divine Orbs to craft powerful items with Critical Damage, Freeze Chance, and Mana Regeneration modifiers. Use Essences and Fossils to create high-tier gear that can boost your damage potential and survivability.

Platforms like MMOexp are perfect for purchasing POE currency or items to expedite your build’s progression, especially if you're seeking rare crafting materials or buy Path of exile currency endgame gear.

Conclusion
The Mercenary Build in Path of Exile 2 offers an exciting, explosive playstyle that leverages crowd control and burst damage. With the right skill gems, support gems, and POE currency investments, you can easily tackle the toughest challenges in both campaign and endgame content. Make sure to optimize your gear and carefully synergize your abilities to achieve the maximum potential of this dynamic build. Happy hunting, Exile!